Russia’s repeated shielding of the Asad regime from investigation and censure by the UN Security Council meant further UN-sponsored action was not possible. On 10 April, Russia vetoed a draft Resolution that would have established an independent UN investigation. This follows their termination of the independent Organisation for the Prohibition of Chemical Weapons-UN Joint Investigative Mechanism last year after the appalling chemical weapons attack in Khan Sheikhoun. Russia has used its veto six times on the topic of chemical weapons use in Syria since the start of 2017. The military action undertaken by the UK was permitted under international law as set out in the government’s legal position, which can be viewed on the gov.uk website.